Enable backports for stdlib.

Provide backports for Prime (new in 1.9),
Matrix (overwrites previous versions) and
Set (patches if required)

Rakefile

@@ -49,6 +49,7 @@ task :default => :test
 
 require 'rake/rdoctask'
 Rake::RDocTask.new do |rdoc|
+  require 'yaml'
   if File.exist?('VERSION.yml')
     config = YAML.load(File.read('VERSION.yml'))
     version = "#{config[:major]}.#{config[:minor]}.#{config[:patch]}"

lib/backports/1.9.1/stdlib.rb

@@ -0,0 +1 @@
+$LOAD_PATH << File.expand_path("../stdlib_new", __FILE__)